Bubble machine



FIG. 1 is a top front perspective view of a bubble machine showing the claimed new design;

FIG. 2 is a bottom rear perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a right side elevation view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof;

FIG. 9 is an enlarged view of the design features included within circle 9 of FIG. 1; and,

FIG. 10 is an enlarged view of the design features included within circle 10 of FIG. 7.

The broken lines depict portions of the bubble machine that form no part of the claimed design. 

CLAIM The ornamental design for a bubble machine, as shown and described. 